Chemical composition(%)

Mechanical properties

Advantages of S235JR:

 High International Recognition: Complies with the European EN 10025 standard, it is the most universal basic carbon structural steel in the global European standard system. Excellent Machining Performance: Adopts a low-carbon design, excellent weldability, high-quality welding can be achieved without preheating, the strength of the weld joint is consistent with the base material, there is no risk of welding cracks, and it is suitable for the secondary processing needs of steel structures, machinery manufacturing and other export products. Wide Range of Applications and Stable Demand: Suitable for various low-strength structural scenarios such as light buildings, bridge components, general mechanical parts, small frames, support components, and hardware accessories. Export market demand is stable year-round, especially in European and Middle Eastern infrastructure projects where demand is strong. There is no need to worry about limited application scenarios, and it can meet the bulk purchase needs of overseas customers. It is one of the most popular basic European standard structural steels for export. 

S235JR Disadvantages:

Moderate Corrosion Resistance:Lacking specialized anti-corrosion alloying elements (such as Cr and Ni), its resistance to atmospheric and seawater corrosion is weak. Long-term outdoor use or in humid or corrosive environments requires anti-corrosion treatments such as painting or galvanizing; otherwise, it is prone to rusting.

Low Strength, Limited Applications:As a low-strength carbon structural steel, its yield strength is only 225-235 MPa, making it unsuitable for medium-to-heavy load applications such as large bridges, engineering machinery, and high-rise building structures. It can only be used for low-load structures, and its export applications are limited to light-duty and general-purpose applications.

Lack of Low-Temperature Toughness Advantage:It only meets the impact requirements at room temperature (20℃). Its toughness significantly decreases in low-temperature environments below -10℃, making it prone to brittle fracture and unsuitable for outdoor structural applications in extremely cold high-latitude regions.

Our factory strictly adheres to the ASTM A572 standard, deeply meeting the core requirements of this standard for A572 Grade 50 steel. Relying on mature smelting processes, we precisely control the content of basic elements such as C, Si, and Mn, strictly control the content of P and S impurities (P≤0.040%, S≤0.050%), and precisely proportion Nb, V, and Ti microalloying elements, ensuring no excess impurities remain. This solves the pain points of inaccurate element control and large batch fluctuations common among ordinary manufacturers. Each batch of products comes with a complete original material certificate (MTC), which can be verified through third-party testing.

We employ advanced hot rolling technology, combined with refined production control and optimized rolling parameters, ensuring that the steel plate surface is smooth, free of inclusions and cracks, and meets appearance quality standards. The product continues the advantages of the A572 Grade 50 low-carbon + microalloy design, optimizing welding performance and achieving high-quality welding without preheating. It provides professional welding guidance, clarifies welding parameters, and reduces processing difficulty for customers. At the same time, it improves cold working performance by reducing cold working deformation of thick steel plates through process optimization, and can easily achieve processing operations such as bending, stamping, cutting, and rolling.